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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
NET SALES $ 153,363 $ 147,597 $ 455,385 $ 452,525
COSTS OF OPERATIONS 137,713 130,481 406,737 403,402
GROSS PROFIT 15,650 17,116 48,648 49,123
OPERATING EXPENSES:        
Selling, general and administrative expenses 8,580 8,495 26,690 24,823
Interest expense, net 469 359 1,162 816
Other (income) expense, net (106) (238) (590) (451)
Total operating expenses 8,943 8,616 27,262 25,188
INCOME BEFORE INCOME TAXES 6,707 8,500 21,386 23,935
INCOME TAX PROVISION 2,251 2,978 7,666 8,466
NET INCOME $ 4,456 $ 5,522 $ 13,720 $ 15,469
BASIC INCOME PER COMMON SHARE (in dollars per share) $ 0.39 $ 0.49 $ 1.21 $ 1.36
DILUTED INCOME PER COMMON SHARE (in dollars per share) 0.39 0.49 1.21 1.36
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.18 $ 0.17 $ 0.54 $ 0.51
WEIGHTED AVERAGE SHARES OUTSTANDING:        
Basic (in shares) 11,364 11,346 11,357 11,346
Diluted (in shares) 11,373 11,374 11,376 11,374